Cheapest and most effective robot is the Mk-1 Homo Sapiens. Tellingly, it hasn't gotten bad enough for them to send their people in to the heavily radiation affected areas yet. The situation at the plant is stable enough that it can be abandoned for stretches and not be expected to destabilise quickly.
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--m(^0^)m-- Wot, no sig?
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--m(^0^)m-- Wot, no sig?